Manufacture of substantive polyazo-dyestuffs



BER EARD itioimnn, or

Patented Oct. 27, 1931 UNITEDSTATES RA NT'YOFFICEAiulinnrnc'runniorsuiasrm vn ronYnzo-nyns'rnrrs a No Drawing.Application'nled November 17, 1930, Serial No. 496,337; and in GermanyNovember 29, 1929.

- light, but of essentially greener shade can be T Thisinvention'relatesxto' an improvement to or a modification in themanufacture of Substantive polyazo-dyestufl's disclosed by the U. S.patent application Ser. No. 496,336}

filed November 17, 1930.

In the co-pending application the -manu-i.

facture of polyazo-dyestufis consists in coupling the 'diazo-compound ofa disaZo-dye stuff of the type: i l i in which A representsthe residueofa-bem zene ornaphthalene sulphonic or-carboxylic acid and M and Mrepresent the residue of *a-naphthylamine, 1 naphthylamine 6 sul phonicacid, 1-naphthylamine-7-sulphonic acid-or a'imiXtureof both of these,witha 'mono-azo-dycstufi obtainable by coupling in acid solution adiazo-body with 2: 5-aminonaphthol-7-monosulphonic acid.

7 polyazo-dyestuffs of remarkable 'fastness to? obtained by couplingazdiazo-compound ofa disazo dyestufi' of the type? Q wherein Arepresents the residue of a benzene or naphthalene. derivative, B theresidue of a-naphthylamine, 1 naphthylamine -6 sul acid or a mixturethereof, and C the residue of V: a .1-amin0 2 naphtholethersfi-sulphonicacid, with a monoazodyestufi' obtainable by cou- .pling in acid solutionj .a diazo-body with placement of the shade to green; they yield oncotton directly bluish green tints of excellent 'fastness to light andare also characterized by a remarkable purity oftheirtints. I Thefollowing'example illustrates the in- "vention, the parts being byweight.

SEL,.swiwznenimy-Assmnon 'ro FIRM in. anions. A, p or BASEL,SWITZERLAND.

17 3 parts of metanilic acid are diazotized and coupled with 24.5 partsof Cleves acid 117. The product is diazotized' further, thediazo-compound is isolated and then coupled in acetic acid solution with28.9 arts of 1:2- aminonaphtholethylether-fi-sulp onic acid.

When coupling iscompl'ete the product is further diazotized and the'diazo-compound .salted out and isolatedi This brownviolet diam-compoundis made into a paste and introduced at 0 G. into a solution consistingof 150 parts of water, 200 parts of commercial pyridine and parts ofammonia solution of It has been found that likewise precious-20 percent. strength and the dyestuff which is; obtainable by acid coupling of173 parts of-diazotized metanilici'acid with 24 parts of 2 5 7-aminonaphtholsulphonic acid. When this coupling is finishedthe dyestufiwhich has separated in a bronze coloured form is iso- --lated and dried.I It dyes cotton directlyblue the dyestufi from aniline-3.: G-disul-.phonicacid, a-naphthylamine and 1-amino-2-,naphtholmethylethen6+sulphonic acid is combined with the mono'azodyefrom sulphanilic acid .;and .2 5-aminonaphthol-7-sulphonic acid coupledin acid solution, a po1yazo-dyeacid or mixture thereof, and C theresidue of; a, 1-amino-2rnaphtholether-6-sulphonic acid, whilst Rrepresents a residue of a ben- Vzene or naphthalene derivative; saiddyestuffs light.

6. As new article of manufacture, the heredyeing cotton blue green tintsfast to in described substantive polyazo-dyestuif, as obtainedaccordingto claim 2 and having fsaiddyestufi dyeing cotton blue greentints I 7. As new article of manufacture, the herein describedsubstantive polyazo-dyestuif as obtained according to claim 3 and havingprobably the formula:

I scan on a fast to light. I V I a 8. As new article of manufacture, thehere in described substantive polyazo-dyestufl' as obtained according toclaim and'having probably the formula:

OCH:

LN M

said dyestuif dyeing cotton blue green tints In witness whereof I havehereunto signed I my name this 6th day of November, 1930.

BERNHARD RICHARD.

